Unable to reset Shopify API compare at price

[aswanevelder]

I used to be able to set compare_at_price to null after a product was on sale but now I get an error

Example:

Price was: 1000, Compare at 1200

I want to reset it the Price to 1200, with compare at 0.

(422 Unprocessable Entity) compare_at_price: Compare at price needs to be higher than Price

I can neither set it to 0, so how will I disable the compare_at_price to 0 or null or remove it?

var variant = await productVariantService.UpdateAsync(product.VariantId.Value, new ProductVariant()
{
      Price = updatePrice,
      CompareAtPrice = updateCompareAtPrice
});

[ThatBrianK]

I am also experiencing this issue. I've been trying to modify the source code by changing the default value handling to
DefaultValueHandling = DefaultValueHandling.Include

however it still does not include the default value of null.
I don't understand much about serialization but in debugging, I can't even see the raw text being sent.
If I send JSON directly in Postman with a value of null, it does in fact work but I can't figure out how to get the ShopifySharp to do that.

[ThatBrianK]

someone coded a workaround here:
#373

But I can't get this to compile even.
If anyone can assist that would be amazing!

[rohanp1903]

This is based on #373

public class ProductVariantServiceEx : ProductVariantService
{
public ProductVariantServiceEx(string myShopifyUrl, string shopAccessToken) : base(myShopifyUrl, shopAccessToken) { }

    public virtual async Task<ProductVariant> UpdateAsync(long productVariantId, ProductVariant variant)
    {
        try
        {
            // BUGFIX: If variant.CompareAtPrice is set to 0, then force it to empty
            string json = new JsonContent(new { variant }).ReadAsStringAsync().Result;

            if (json.Contains("\"compare_at_price\":0.00}")
                || json.Contains("\"compare_at_price\":0.00,"))
            {
                json = json.Replace("\"compare_at_price\":0.00", "\"compare_at_price\":\"\"");

                var req = PrepareRequest($"variants/{productVariantId}.json");
                using var content = new StringContent(json, Encoding.UTF8, "application/json");
                await Task.Run(() => Thread.Sleep(500));
                return (await ExecuteRequestAsync<ProductVariant>(req, HttpMethod.Put, default, content, "variant")
                    .ConfigureAwait(false)).Result;
            }

            return await base.UpdateAsync(productVariantId, variant);
        }
        catch (Exception ex)
        {
            return null;
        }
    }
}

[ThatBrianK]

Thanks Rohan!
I had to modify it slightly to work for me since my prices showed up as 0.0 not 0.00 but otherwise perfect. I tried posting in my modified code but it was not formatting correctly

Brian

[aswanevelder]

Thanks guys! Great help!